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Debt Obligations (Schedule of Long Term Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
May 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Total long term obligations $ 458,721   $ 317,658
Less: current portion (29,306)   (33,740)
Total long term obligations, net $ 429,415   283,918
Unsubordinated term loan and Revolving credit facility [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Collateral, Coverage Percentage 150.00%    
Unsubordinated term loan [Member]      
Debt Instrument [Line Items]      
Total long term obligations $ 85,636   100,708
Revolving credit facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Accordion Feature Amount   $ 100,000  
Total long term obligations 355,000   180,000
Aircraft loans [Member]      
Debt Instrument [Line Items]      
Total long term obligations $ 18,085   $ 36,950